April 22, 1992 - Adam Lanza
The Sandy Hook shooting of December 2012 remains among the most devastating acts of mass violence in American history, in large part because of the age of most victims — twenty first-grade children, none older than seven. The attack unfolded within minutes and produced a casualty count that prompted a sustained national reckoning over gun policy, school safety, and the limits of mental health intervention. Investigators and researchers who later examined Lanza's background found a years-long trajectory of severe social withdrawal, an obsessive engagement with mass violence as a subject, and a near-total detachment from the outside world in the period leading up to the shooting.
From Wikipedia
Adam Peter Lanza (April 22, 1992 – December 14, 2012) was an American mass murderer who perpetrated the Sandy Hook Elementary School shooting, one of the deadliest school shootings in the US. On December 14, 2012, he fatally shot his mother, Nancy Lanza, at their home in Newtown, Connecticut, before driving to Sandy Hook Elementary School, where he killed 20 children aged six and seven, and six adult staff members. He then killed himself as law enforcement arrived at the school.
Lanza was born in Exeter, New Hampshire, and grew up in Newtown, Connecticut, where he was raised primarily by his mother following his parents' divorce in 2008. From an early age, he was diagnosed with a number of neurodevelopmental conditions, including Asperger syndrome, sensory processing disorder, and obsessive-compulsive disorder. He was described by those who knew him as highly intelligent but profoundly withdrawn. He struggled throughout his childhood and adolescence with social interaction and emotional regulation, and hated to be touched.
As a teenager, Lanza became increasingly isolated and stopped attending school. His anxiety led to him being placed on homebound status, where he received instruction at home rather than attending classes.
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